I followed the good advice from Dietz and Beat : I started with decoupling my Genelec monitors from my desk, then reducing the wet slider in Mir, trying all mic setups, and finally sweeping a negative bell EQ through the reverb tail. So far, here are my results. It seems way better than it used to be, while I'm still not 100% satisfied. The remaining problem being that, when playing loud, the sound becomes harsh (which is not the case when I play Daft Punk on the same system).
So here is a live performance (cello, piano and soprano saxophone) together with solo and dimension strings and zero-G prima voices. All the outro is vsl only, mixed with Mariastrassengel a little enhanced with a lexicon emulation.
I hope you'll enjoy and keep the good advice coming up (it is so nice to learn from each other).